Incefa-Plus Project: Lessons Learned From the Project Data and Impact on Existing Fatigue Assessment Procedures

2021 ◽  
Author(s):  
Sam Cuvilliez ◽  
Alec Mclennan ◽  
Jonathan Mann ◽  
Matthias Bruchhausen ◽  
Kevin Mottershead
Keyword(s):  
Lessons Learned ◽  
Fatigue Assessment ◽  
Project Data ◽  
Assessment Procedures

INCEFA-PLUS Project: Lessons Learned From the Project Data and Impact on Existing Fatigue Assessment Procedures

2020 ◽  
Author(s):  
Sam Cuvilliez ◽  
Alec McLennan ◽  
Kevin Mottershead ◽  
Jonathan Mann ◽  
Matthias Bruchhausen
Keyword(s):  
Surface Finish ◽  
Environmental Effects ◽  
Nuclear Power ◽  
Power Plants ◽  
Lessons Learned ◽  
Fatigue Assessment ◽  
Data Points ◽  
Project Data ◽  
Assessment Procedures ◽  
Surface Finish Effect

Abstract The INCEFA+ project (INcreasing Safety in nuclear power plants by Covering gaps in Environmental Fatigue Assessment) is a five year project supported by the European Commission HORIZON2020 programme, which will conclude in June 2020. This project aims to generate and analyse Environmental Assisted Fatigue (EAF) experimental data (approximately 230 fatigue data points generated on austenitic stainless steel), and focuses on the effect of several key parameters such as mean strain, hold times and surface finish, and how they interact with environmental effects (air or PWR environment). This work focuses on the analysis of the data obtained during the INCEFA+ project. More specifically, this paper discusses how the outcome of this analysis can be used to evaluate existing fatigue assessment procedures that incorporate environmental effects in a similar way to NUREG/CR-6909. A key difference between these approaches and the NUREG/CR-6909 is the reduction of conservatisms resulting from the joint implementation of the adjustment sub-factor related to surface finish effect (as quantified in the design air curve derivation) and a Fen penalization factor for fatigue assessment of a location subjected to a PWR primary environment. The analysis presented in this paper indicates that the adjustment (sub-)factor on life associated with the effect of surface finish in air (as described in the derivation of the design air curve in NUREG/CR-6909) leads to substantial conservatisms when it is used to predict fatigue lifetimes in PWR environments for rough specimens. The corresponding margins can be explicitly quantified against the design air curve used for EAF assessment, but may also depend on the environmental correction Fen factor expression that is used to take environmental effects into account.

Incefa-Plus Project: Lessons Learned From the Project Data and Impact on Existing Fatigue Assessment Procedures

2020 ◽  
Vol 142 (6) ◽  
Author(s):  
Sam Cuvilliez ◽  
Alec McLennan ◽  
Kevin Mottershead ◽  
Jonathan Mann ◽  
Matthias Bruchhausen
Keyword(s):  
Surface Finish ◽  
Environmental Effects ◽  
Nuclear Power ◽  
Power Plants ◽  
Lessons Learned ◽  
Pressurized Water ◽  
Fatigue Assessment ◽  
Horizon 2020 ◽  
Project Data ◽  
Assessment Procedures

Abstract This work focuses on the analysis of the data generated during the INCEFA+ project (INcreasing safety in nuclear power plants (NPPs) by Covering gaps in Environmental Fatigue Assessment, a five-year project supported by the European Commission Horizon 2020 program). More specifically, this paper discusses how the outcome of this analysis can be used to evaluate existing fatigue assessment procedures that incorporate environmental effects in a similar way to NUREG/CR-6909. A key difference between these approaches and the NUREG/CR-6909 is the reduction of conservatisms resulting from the joint implementation of the adjustment subfactor related to surface finish effect (as quantified in the design air curve derivation) and a Fen penalization factor for fatigue assessment of a location subjected to a pressurized water reactor (PWR) primary environment. The analysis presented in this paper indicates that the adjustment (sub-) factor on life associated with the effect of surface finish in air (as described in the derivation of the design air curve in NUREG/CR-6909) leads to substantial conservatisms when it is used to predict fatigue lifetimes in PWR environments for rough specimens. The corresponding margins can be explicitly quantified against the design air curve used for environmentally assisted fatigue (EAF) assessment, but may also depend on the environmental correction Fen factor expression that is used to take environmental effects into account.

Automation Integration Over the Project Lifecycle for the Pueblo Chemical Agent-Destruction Pilot Plant

2004 ◽  
Author(s):  
Brock K. Parsons ◽  
John E. James ◽  
Mark C. Reuss
Keyword(s):  
Lessons Learned ◽  
Cultural Integration ◽  
Chemical Agent ◽  
Design Data ◽  
Team Members ◽  
Geographically Dispersed ◽  
Construction Operation ◽  
Project Data ◽  
Support Engineering ◽  
Project Lifecycle

The architecture of an integrated suite of automation tools used to manage all project data for a major engineered facility is described. This paper discusses how these tools are configured to manage and manipulate the generation of design data by geographically dispersed team members; to support engineering, procurement, construction, operation and decommissioning; and to maintain data integrity throughout the project lifecycle. The challenges of team collaboration, knowledge management, cultural integration, and lessons learned are described.

scholarly journals Environmental Fatigue Analysis of Nuclear Structural Components: Assessment Procedures, Loads, and a Case Study

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 609
Author(s):  
Sergio Cicero ◽  
Thomas Metais ◽  
Yuliya Voloshyna ◽  
Sam Cuvillez ◽  
Sergio Arrieta ◽  
...  
Keyword(s):  
Real Data ◽  
Structural Components ◽  
Engineering Process ◽  
Specific Procedure ◽  
Fatigue Assessment ◽  
Different Types ◽  
Nuclear Component ◽  
Complex Engineering ◽  
Assessment Procedures

Nowadays, environmental fatigue assessment is mandatory in many countries, in the design and operational stages of nuclear structural components. The analysis of environmental fatigue can be a complex engineering process that is generally performed following national or international procedures. Such procedures are not always based on the same assumptions, and novel analysts may find a confusing variety of documents. Moreover, once a specific procedure has been chosen for the analysis, it is possible to complete the fatigue assessment by using design transients (and loads) or, alternatively, real loads provided by monitoring systems. In this context, this paper provides a comprehensive review of the different environmental fatigue assessment procedures and a brief description of the different types of load inputs (design vs. real data). The work is completed with a case study, in which the (fatigue) cumulative usage factor is estimated in a particular nuclear component by using one of the abovementioned assessment procedures (NUREG/CR-6909) and two options for the load inputs.

Assessing Polyvictimization in a Family Justice Center: Lessons Learned From a Demonstration Project

2021 ◽  
pp. 088626052110279
Author(s):  
Danielle M. Romain Dagenhardt ◽  
Joshua Mersky ◽  
James “Dimitri” Topitzes ◽  
Erin Schubert ◽  
Amber E. Krushas
Keyword(s):  
Partner Violence ◽  
Assessment Tool ◽  
Qualitative Interviews ◽  
Lessons Learned ◽  
Assessment Tools ◽  
Measurement Development ◽  
Social Service Agencies ◽  
Promising Line ◽  
Assessment Procedures ◽  
The Impact

There is a growing interest in developing comprehensive assessments that measure intimate partner violence (IPV) alongside other adverse events that correlate with IPV and compound its effects. One promising line of research in this area has focused on the impact of exposure to multiple types of victimization, i.e., polyvictimization. The purpose of this study is to examine the experience of administration of a polyvictimization tool from staff and client perspectives in order to inform future tool developments and assessment procedures. Qualitative interviews and focus groups with clients and staff from a family justice center who had experience with the assessment tool were used to identify strengths and challenges of the assessment too and inform future tool development. Findings demonstrate that an assessment tool provides the space for clients to talk about trauma and facilitate empowerment, while providing the opportunity for psychoeducation and service referrals. Concerns about the assessment tool included adverse reactions without proper framing and language, as well as shifting the emphasis from screening for adversities toward strengths, coping skills, and resilience. Implications for future measurement development and establishing best practices in polyvictimization assessment are discussed, with an emphasis on the benefits of social service agencies utilizing assessment tools.

Testing an Automated Collision Avoidance and Emergency Braking System for Buses

2020 ◽  
Vol 2674 (4) ◽  
pp. 66-74
Author(s):  
Heidi H. Soule ◽  
Skip Huck ◽  
Andrew Krum ◽  
Yinhai Wang ◽  
Ruimin Ke ◽  
...  
Keyword(s):  
Collision Avoidance ◽  
Lessons Learned ◽  
Advanced Technology ◽  
False Negatives ◽  
Smart Transportation ◽  
Emergency Braking ◽  
Braking System ◽  
Safety Research ◽  
Project Data ◽  
Transportation Applications

In 2017 the Federal Transit Administration (FTA) awarded Pierce Transit of Lakewood, WA a $1.66 million grant for a bus collision avoidance and mitigation safety research and demonstration project. The project scope includes installation of an advanced technology package, the Pedestrian Avoidance Safety System (PASS) that uses lidar sensors to trigger an automated deceleration and braking system. An “alpha testing” phase included shipping a Pierce Transit bus to Blacksburg, VA for closed-course testing of PASS on Virginia Tech Transportation Institute’s (VTTI’s) Smart Road facility. In addition, VTTI developed a system to observe, measure, and analyze passenger motion during braking events. Following completion of testing at VTTI, the bus will be returned to Pierce Transit. Together with three additional buses currently being outfitted with PASS, all four will be equipped with Transit Event Logging System (TELS) video processers developed by University of Washington’s Smart Transportation Applications & Research (STAR) Lab to analyze PASS accuracy for “false positives” and “false negatives.” Upon successful completion of in-service engineering testing of the initial four buses, an additional 26 buses will be equipped with PASS and all 30 will be monitored using telematics for a year-long demonstration. This paper discusses project background and organization, describes the PASS being tested, provides an overview of the alpha testing, describes project data collection processes, and reviews the criteria and metrics being used to evaluate the system. The paper concludes with observations about lessons learned to date.

IIW Fatigue Assessment Procedures

2016 ◽  
pp. 11-18
Author(s):  
Bertil Jonsson ◽  
G. Dobmann ◽  
A. F. Hobbacher ◽  
M. Kassner ◽  
G. Marquis
Keyword(s):  
Fatigue Assessment ◽  
Assessment Procedures

Criteria for Fatigue Failure of Materials: Application in Fatigue Assessment of Structures

2018 ◽  
Vol 26 ◽  
pp. 1-8
Author(s):  
Sergei Petinov ◽  
Ruslan Guchinsky
Keyword(s):  
Fatigue Failure ◽  
Strain Energy ◽  
Hot Spot ◽  
Inelastic Strain ◽  
Fatigue Properties ◽  
Hot Spot Stress ◽  
Fatigue Assessment ◽  
Notch Stress ◽  
Assessment Procedures ◽  
Nominal Stress Approach

Presently in rules for fatigue assessment of structures subjected to intensive alternating service loading the Stress-Life (S-N) criteria are recommended in versions of the Nominal stress approach, Hot-spot stress and Notch-stress approach based on using the stress range a representative of the current damage. The criteria and approaches provide assessment of fatigue properties of structures accompanied with a series of approximations and uncertainties. A physically and mechanically more correct procedures might be provided by the Strain-life and Inelastic strain energy criteria for fatigue failure and approaches, although specific with intrinsic sources of approximations. The nature of approximations in the approaches is briefly commented and feasible means of improvement the fatigue assessment procedures and applications are presented.

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